web2nala

Back to your original question though.  The main advantage that the K1 has is that historically it has been as much faster route to uniting in the USA as compared to the CR1.  But in the current climate, the time difference is almost negligible.  So when you compare that to the advantages of the CR1 previously mentioned, I think that the CR1 is the best route by far.

Also, you cannot correlate this filing to your previous one in 2016.  Although its only been two years, the visa landscape has changed a lot in that time.  Times frames have grown much larger and evidence of relationships is being scrutinized more.

You may also want to consider contacting the site/app.  My wife and I met on an Asian dating site and before filing I sent them a message through support asking for a statement.  Within a couple hours, they responded with a prepared statement regarding not being a paid marriage broker addressed to the USCIS.  I can only assume that this is a common request for them.

When my wife went through the K1 process, her son was had a problem with the medical (he had PTB when younger and they required him to go through another treatment process before giving him a clear medical certificate).  Since the treatment took over six months, my wife completed the process and came to the US while her son stayed in the Philippines for treatment.  Once he got a clear medical, my wife completed a Power of Attorney form for her sister and her sister completed the process including taking my stepson to the interview. The Power of Attorney may not have been necessary for just the interview but the Philippines has requirements for citizens immigrating out and with the POA in place we had no problems with the process.

When my wife went through the K1 process, her son was had a problem with the medical (he had PTB when younger and they required him to go through another treatment process before giving him a clear medical certificate).  Since the treatment took over six months, my wife completed the process and came to the US while her son stayed in the Philippines for treatment.  Once he got a clear medical, my wife completed a Power of Attorney form for her sister and her sister completed the process including taking my stepson to the interview. The Power of Attorney may not have been necessary for just the interview but the Philippines has requirements for citizens immigrating out and with the POA in place we had no problems with the process.

He may be referring to the fact that whether or not a K1 visa holder will be allowed renter to the "States" from a territory is somewhat under debate.  The USCIS clearly states on its website that travel to the territories are fine once an I-485 has been filed, even without AP.  But this does not address a K1 visa holder that has not submitted for AOS.  Also the US CBP  sees this as an arrival from foreign country.  This is the quote from their website regarding travel to and from U.S. territories..
 
"Entry requirements for non-U.S. citizens are the same as for entering the United States from any foreign destination"
 
Although it is unlikely that a custom/immigration official will check someone coming in from a Territory, it can happen. and things could get complicated.

He may be referring to the fact that whether or not a K1 visa holder will be allowed renter to the "States" from a territory is somewhat under debate.  The USCIS clearly states on its website that travel to the territories are fine once an I-485 has been filed, even without AP.  But this does not address a K1 visa holder that has not submitted for AOS.  Also the US CBP  sees this as an arrival from foreign country.  This is the quote from their website regarding travel to and from U.S. territories..
 
"Entry requirements for non-U.S. citizens are the same as for entering the United States from any foreign destination"
 
Although it is unlikely that a custom/immigration official will check someone coming in from a Territory, it can happen. and things could get complicated.